Photoredox-catalyzed synthesis of sulfonated dihydrofurans from olefinic carbonyls through the insertion of sulfur dioxide

Abstract

Photoredox-catalyzed generation of sulfonated dihydrofurans starting from olefinic carbonyls, DABCO·(SO₂)₂, and aryldiazonium salts has been developed. This protocol enables efficient access to various sulfonated dihydrofurans with moderate to good yields. This transformation involves the sequential insertion of sulfur dioxide, intermolecular sulfonylation of alkenes and intramolecular cyclization via a radical process.